Date: Fri, 15 Apr 2011 11:47:20 +0530 From: "Jayachandran C." <c.jayachandran@gmail.com> To: Andrew Duane <aduane@juniper.net> Cc: "mips@freebsd.org" <mips@freebsd.org> Subject: Re: Trouble with dynamic executables Message-ID: <BANLkTimoc9Xd50LgiubDJGKOiUjztF-EfQ@mail.gmail.com> In-Reply-To: <AC6674AB7BC78549BB231821ABF7A9AEB53018A224@EMBX01-WF.jnpr.net> References: <AC6674AB7BC78549BB231821ABF7A9AEB53018A09F@EMBX01-WF.jnpr.net> <BANLkTi=Jw=q5sUVs8-sEG09nSHwFbMFKjw@mail.gmail.com> <AC6674AB7BC78549BB231821ABF7A9AEB53018A224@EMBX01-WF.jnpr.net>
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On Fri, Apr 15, 2011 at 12:47 AM, Andrew Duane <aduane@juniper.net> wrote:
> I've figured out what the problem is. The elf header of a sample dynamic =
executable shows:
>
> Elf file type is EXEC (Executable file)
> Entry point 0x1200028f0
> There are 7 program headers, starting at offset 64
>
> Program Headers:
> =A0Type =A0 =A0 =A0 =A0 =A0 Offset =A0 =A0 =A0 =A0 =A0 =A0 VirtAddr =A0 =
=A0 =A0 =A0 =A0 PhysAddr =A0 =A0 =A0 =A0 =A0 FileSiz =A0 =A0 =A0 =A0 =A0 =
=A0MemSiz =A0 =A0 =A0 =A0 =A0 =A0 =A0Flags =A0Align
> =A0PHDR =A0 =A0 =A0 =A0 =A0 0x0000000000000040 0x0000000120000040 0x00000=
00120000040 0x0000000000000188 0x0000000000000188 =A0R E =A0 =A08
> =A0INTERP =A0 =A0 =A0 =A0 0x0000000000012788 0x0000000120012788 0x0000000=
120012788 0x0000000000000015 0x0000000000000015 =A0R =A0 =A0 =A01
> =A0 =A0 =A0[Requesting program interpreter: /libexec/ld-elf.so.1]
> =A0LOAD =A0 =A0 =A0 =A0 =A0 0x0000000000000000 0x0000000120000000 0x00000=
00120000000 0x00000000000127bc 0x00000000000127bc =A0R E =A0 =A010000
> =A0LOAD =A0 =A0 =A0 =A0 =A0 0x0000000000013000 0x0000000120023000 0x00000=
00120023000 0x00000000000017d8 0x0000000000003c28 =A0RW =A0 =A0 10000
> =A0DYNAMIC =A0 =A0 =A0 =A00x0000000000000808 0x0000000120000808 0x0000000=
120000808 0x00000000000001e0 0x00000000000001e0 =A0RWE =A0 =A08
> =A0NOTE =A0 =A0 =A0 =A0 =A0 0x00000000000127a4 0x00000001200127a4 0x00000=
001200127a4 0x0000000000000018 0x0000000000000018 =A0R =A0 =A0 =A04
> =A0NULL =A0 =A0 =A0 =A0 =A0 0x0000000000000000 0x0000000000000000 0x00000=
00000000000 0x0000000000000000 0x0000000000000000 =A0 =A0 =A0 =A0 8
>
> Note section 1 the INTERP header: the offset is 0x12788. There's a check =
in the ELF64 image activator to see if the offset is outside the first page=
and returns ENOEXEC. The exec path reads in the first page first, and trie=
s to figure out what to do with the rest. So if the interpreter name isn't =
in the first page, it can't decode it.
>
> This is a toolchain issue, or some setup issue.
This may be a mip64r2 issue.
I use the mips64 config and 32 and 64 bit dynamic executables have
been working for a long time.
For reference, here is my setup:
Environment for buildworld:
export TARGET=3Dmips
export TARGET_ARCH=3Dmips64eb
export TARGET_CPUTYPE=3Dmips64
Makeoptions in conf file (from XLP64)
makeoptions KERNLOADADDR=3D0xffffffff80100000
makeoptions ARCH_FLAGS=3D"-march=3Dmips64 -mabi=3D64"
options ISA_MIPS64
And on the XLR engineering board:
xlrboard# uname -a
FreeBSD xlrboard.netlogicmicro.com 9.0-CURRENT FreeBSD 9.0-CURRENT #2
r220649M: Fri Apr 15 11:27:57 IST 2011
jc@daemon.razamicroelectronics.com:/var/obj/jc/freebsd-obj-64/mips.mips64eb=
/work/jayachandranc/freebsd-devel-clean/sys/XLRJC64
mips
xlrboard# ldd /bin/ls
/bin/ls:
libutil.so.9 =3D> /lib/libutil.so.9 (0x16024d000)
libncurses.so.8 =3D> /lib/libncurses.so.8 (0x16035f000)
libc.so.7 =3D> /lib/libc.so.7 (0x1604b3000)
xlrboard# readelf -a /bin/ls
ELF Header:
Magic: 7f 45 4c 46 02 02 01 09 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, big endian
Version: 1 (current)
OS/ABI: UNIX - FreeBSD
ABI Version: 0
Type: EXEC (Executable file)
Machine: MIPS R3000
Version: 0x1
Entry point address: 0x120001dd0
Start of program headers: 64 (bytes into file)
Start of section headers: 34808 (bytes into file)
Flags: 0x60000007, noreorder, pic, cpic, mips=
64
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 6
Size of section headers: 64 (bytes)
Number of section headers: 29
Section header string table index: 28
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .interp PROGBITS 0000000120000190 00000190
0000000000000015 0000000000000000 A 0 0 1
[ 2] .note.ABI-tag NOTE 00000001200001a8 000001a8
0000000000000018 0000000000000000 A 0 0 4
[ 3] .MIPS.options MIPS_OPTIONS 00000001200001c0 000001c0
0000000000000168 0000000000000001 Ao 0 0 8
[ 4] .dynamic DYNAMIC 0000000120000328 00000328
0000000000000200 0000000000000010 A 7 0 8
[ 5] .hash HASH 0000000120000528 00000528
0000000000000450 0000000000000004 A 6 0 8
[ 6] .dynsym DYNSYM 0000000120000978 00000978
....
The .interp offset is reasonable here...
JC.
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